Disscussing old, rare, very specific or otherwise uncommon units and measurements
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Mon Mar 15, 2004 9:09 pm
Can anyone help me convert British Thermal Units per hour foot farhenheit, Btu/hr.ft.F, to Watts per metre Kelvin, W/m.K.
Regards
Willmot
Tue Mar 16, 2004 12:54 am
Willmot wrote:Can anyone help me convert British Thermal Units per hour foot farhenheit, Btu/hr.ft.F, to Watts per metre Kelvin, W/m.K.
Regards
Willmot
On a quick pass, you can convert convert BTU/hr to Watts by multiplying by 0.2931. You can convert feet to meters by multiplying by 0.3048.
- Code:
BTU | 0.2931 W | 0.3048 Ft |
---------------------------------
Hr·Ft·°f | BTU/Hr | m |
Cancel your terms, and this gives us W/m·°f
Getting °f to Kelvins, you'd first convert °f to °c using °c = (°f-32)·0.5556, then adding 273.1
So, you'd have:
- Code:
W
--------------------------
m·[(0.5556·(°f-32))+273.1]
which will leave you with:
- Code:
W
----
m·K
Thu Jun 24, 2004 9:58 pm
These are units of thermal conductivity. The rate of heat flow (BTU/h or watts) divided by the thickness of the substance (ft or m) divided by the temperature gradient (degrees f or K). As it is a temperature gradient the correct SI unit is not K but degrees K, therefore you do not add 273.1, neither do you subtract 32 from degrees f for the same reason
According to my reference book you just multiply by 1.731 to do the conversion, which is much simpler. It comes from 1.8(degrees f to K) x 0.2931(BTU/h to Watts)/0.3048(ft to m).
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